add image fop manual
Merge remote-tracking branch 'qiniu/develop' into develop
Merge pull request #79 from longshanksmo/develop

add image fop guide
add doc for qrsbox & qrsboxcli
Update qrsbox-cli.markdown
Merge pull request #80 from longshanksmo/develop

merge qrsbox & qrsboxcli docs
Merge pull request #81 from qiniu/develop

merge docs of qrsbox & qrsboxcli